For AD users to be able to log into DCE, you will need to add the authentication server and set up user access rights.

Resolution:

Adding an AD Server and Users/Groups

1) Define a user within your AD server that you will use to make the connection between DCE and your AD server.

NOTE: You may want to ensure that this user is set with a password that does not expire. If the password expires, you will be unable to log in using an AD account to the DCE server until the issue is resolved.

2) Within the DCE client, go to: System menu > Users and Device Group Access.